Superoleophilic, Mechanically Strong Electrospun Membranes for Fast and Efficient Gravity-Driven Oil/Water Separation
Superoleophilic, Mechanically Strong Electrospun Membranes for Fast and Efficient Gravity-Driven Oil/Water Separation
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DOI：
10.1021/acsapm.8b00279
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发表时间：
2019-04-01
影响因子：
5
通讯作者：
Asatekin, Ayse
中科院分区：
文献类型：
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作者：
Sadeghi, Ilin;Govinna, Nelaka;Asatekin, Ayse
从废水处理到生物燃料制造再到石油泄漏的清理，油水混合物的分离是许多过程中的一个常见障碍。迫切需要用于这种分离的新的、快速的和简单的技术。在这项工作中，我们描述了一种简单实用的路线，用于创建超亲油电纺膜，能够选择性地通过油和有机化合物在重力驱动系统中以非常高的速率，同时保留水。为了制备这些膜，我们共混了一种新的，高度氟化的无规共聚物（FCP），聚（甲基丙烯酸甲酯-无规-全氟癸基甲基丙烯酸酯），P（MMA-r-FDMA），与商品聚合物聚（偏氟乙烯）（PVDF），并从它们的混合物制备电纺膜。将该FCP与PVDF共混，经静电纺丝得到了形态均匀、无珠粒的非织造纤维膜。PMMA段提供锚到PVDF基质，导致机械性能的显著增强，共混膜的杨氏模量高达7倍。此外，PVDF基质内的长的侧链FDMA侧基的自组织导致富氟、高度疏水和超亲油的表面。结果，在重力驱动过滤实验中，与纯PVDF膜相比，含FCP的膜表现出高达17倍的油和有机溶剂渗透速度。在70 min的连续重力驱动过滤油水分离实验中，它们的性能高度稳定，反映了它们优异的抗污垢性能。这种易于实施且具有成本效益的方法，结合静电纺丝产生的高孔隙率和凹入结构，可以产生具有优异机械性能和耐污染性的膜。
Separating oil-water mixtures is a common obstacle in many processes from wastewater treatment to biofuel manufacture to cleanup of oil spills. There is an urgent need for new, fast, and simple technologies for such separations. In this work, we describe a simple and practical route for creating superoleophilic electrospun membranes that are capable of selectively passing oil and organic compounds at very high rates in a gravity-driven system while retaining water. To prepare these membranes, we blended a new, highly fluorinated random copolymer (FCP), poly(methyl methacrylate-random-perfluorodecyl methacrylate), P(MMA-r-FDMA), with the commodity polymer poly(vinylidene fluoride) (PVDF) and prepared electrospun membranes from their mixture. Membranes composed of nonwoven fibers with uniform and bead-free morphology were obtained upon electrospinning of PVDF blended with this FCP. The PMMA segments provided anchors to the PVDF matrix, resulting in significant enhancement in the mechanical properties with up to 7 times higher Youngs modulus for the blend membranes. Moreover, the self-organization of the long, pendant FDMA side groups within the PVDF matrix resulted in fluorine-rich, highly hydrophobic and superoleophilic surface. As a result, the FCP-containing membranes exhibited up to 17 times faster permeation of oil and organic solvent, compared with pure PVDF membrane in gravity-driven filtration experiments. Their performance was highly stable during a 70 min continuous gravity-driven filtration experiment for oil/water separation, reflecting their excellent fouling resistant properties. This easy-to-implement and cost-effective approach, combined with the high porosity and re-entrant structure created by the electrospinning, can create membranes with excellent mechanical properties and fouling resistance.